# frozen_string_literal: true

# All the files/directories that should be reviewed by the DB team.
DB_FILES = [
  'db/',
  'app/models/project_authorization.rb',
  'app/services/users/refresh_authorized_projects_service.rb',
  'lib/gitlab/background_migration.rb',
  'lib/gitlab/background_migration/',
  'lib/gitlab/database.rb',
  'lib/gitlab/database/',
  'lib/gitlab/github_import.rb',
  'lib/gitlab/github_import/',
  'lib/gitlab/sql/',
  'rubocop/cop/migration',
  'ee/db/',
  'ee/lib/gitlab/database/'
].freeze

SCHEMA_NOT_UPDATED_MESSAGE = <<~MSG
**New %<migrations>s added but %<schema>s wasn't updated.**

Usually, when adding new %<migrations>s, %<schema>s should be
updated too (unless the migration isn't changing the DB schema
and isn't the most recent one).
MSG

def database_paths_requiring_review(files)
  to_review = []

  files.each do |file|
    review = DB_FILES.any? do |pattern|
      file.start_with?(pattern)
    end

    to_review << file if review
  end

  to_review
end

all_files = git.added_files + git.modified_files

non_geo_db_schema_updated = !git.modified_files.grep(%r{\Adb/schema\.rb}).empty?
geo_db_schema_updated = !git.modified_files.grep(%r{\Aee/db/geo/schema\.rb}).empty?

non_geo_migration_created = !git.added_files.grep(%r{\A(db/(post_)?migrate)/}).empty?
geo_migration_created = !git.added_files.grep(%r{\Aee/db/geo/(post_)?migrate/}).empty?

if non_geo_migration_created && !non_geo_db_schema_updated
  warn format(SCHEMA_NOT_UPDATED_MESSAGE, migrations: 'migrations', schema: gitlab.html_link("db/schema.rb"))
end

if geo_migration_created && !geo_db_schema_updated
  warn format(SCHEMA_NOT_UPDATED_MESSAGE, migrations: 'Geo migrations', schema: gitlab.html_link("ee/db/geo/schema.rb"))
end

db_paths_to_review = database_paths_requiring_review(all_files)

unless db_paths_to_review.empty?
  message 'This merge request adds or changes files that require a ' \
    'review from the Database team.'

  markdown(<<~MARKDOWN.strip)
## Database Review

The following files require a review from the Database team:

* #{db_paths_to_review.map { |path| "`#{path}`" }.join("\n* ")}

To make sure these changes are reviewed, take the following steps:

1. Edit your merge request, and add `gl-database` to the list of Group
   approvers.
1. Mention `@gl-database` in a separate comment, and explain what needs to be
   reviewed by the team. Please don't mention the team until your changes are
   ready for review.
  MARKDOWN

  unless gitlab.mr_labels.include?('database')
    warn 'This merge request is missing the ~database label.'
  end
end
